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Bachtiar Effendi
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INDONESIA
Indonesian Mining Journal
Published by Balai Besar Pengujian Mineral dan Batubara tekMIRA
ISSN : 08549931     EISSN : 25278797     DOI : 10.30556/imj
Core Subject : Science, Social, Engineering,
Chemical Engineering, Chemistry & Bioengineering Chemistry Energy Environmental Science Materials Science & Nanotechnology
This Journal is published periodically two times annually : April and October, containing papers of research and development for mineral and coal, including exploration, exploitation, processing, utilization, environment, economics and policy. The editors only accept relevant papers with the substance of this publication.
Arjuna Subject : Energi (semua kategori) - Energi (Lain-Lain)
Articles 277 Documents
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Bahasa Inggris EVALUASI GEOTEKNIK KELONGSORAN DENGAN PENDEKATAN ANALISIS BALIK PADA LERENG AREA DISPOSAL PIT 'X', TANJUNG ENIM, SUMATRA SELATAN Sugiawati, Gisa Nurputri; Sophian, Raden Irvan; Alfadli, Muhammad Kurniawan; Khoirullah, Nur; Putra, Meilan Aditya
Indonesian Mining Journal Vol 28 No 2 (2025): Indonesian Mining Journal, October 2025
Publisher : Balai Besar Pengujian Mineral dan Batubara tekMIRA

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30556/imj.Vol28.No2.2025.1623

Abstract

In open pit mining, the main activities include excavating the material from its original state and transporting it to the disposal area or stockpile, which forms an embankment. Slope stability in the disposal area should be monitored regularly to prevent losses caused by landslides. If a landslide occurs, it is important to identify the cause as a basis for recommending new slope design and implementing appropriate engineering measures to prevent future landslide occurrences. This study was conducted on a slope that had experienced a landslide in the Pit 'X' disposal area, Tanjung Enim, South Sumatra. This study aims to analyze the cause of the landslide by using a back analysis approach. Slope stability analysis was conducted using the Morgenstern-Price boundary equilibrium method, with failure probabilities calculated using Slide 2 software. Input data consisted of cohesion, internal friction angles, and unit weight of slope material. Based on the slope stability analysis, landslides occurred on slopes with a safety factor of 1 and a 40% probability of failure. This was caused by a 67.43% decrease in cohesion caused by the water-saturated condition of the clay material and the influence of the steep slope geometry. The proposed engineering solutions include slope grading, which increases the factor of safety by 30.31%, and the addition of counterweights, which further increases the factor of safety by 32.10%.
PERBANDINGAN HASIL ANALISIS POLA ALIRAN DENGAN PERSAMAAN RANS DAN LES DALAM COMPUTATIONAL FLUID DYNAMICS (CFD): LITERATURE RIVIEW Thiansy, Elsy; Cahyadi, Tedy Agung; Haq, Shofa Rijalul
Indonesian Mining Journal Vol 28 No 2 (2025): Indonesian Mining Journal, October 2025
Publisher : Balai Besar Pengujian Mineral dan Batubara tekMIRA

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30556/imj.Vol28.No2.2025.1664

Abstract

The settling pond functions to hold and settle suspended particles, especially Total Suspended Solid (TSS) in order to reduce the pollutant load. However, the effectiveness of settling ponds is greatly influenced by the flow characteristics and the concentration of tss carried. This research compares two numerical approaches in Computational Fluid Dynamics (CFD), namely Reynolds-Averaged Navier-Stokes (RANS) and Large Eddy Simulation (LES). Both of these methods are widely used in turbulent flow simulations, but have different approaches and levels of accuracy in representing turbulence structures. This study reviews various recent scientific publications that apply the rans and les equations in internal and external flow cases, including settling pond applications. The review results show that the RANS equation is suitable for large-scale engineering simulations with low computational requirements but is less accurate in capturing turbulence details. The les equation provides more accurate results in capturing turbulent flow patterns than the RANS model. However, tutoring models require greater computational resources, so they need to be considered for more complex applications. From this comparison it can be concluded that the selection of equations in a CFD is very dependent on the analysis objectives, limited computing resources, and the level of data detail required.
BENEFISIASI FISIK PADA PASIR KROMIT KADAR RENDAH MENGGUNAKAN MEJA GOYANG DAN DAVIS TUBE Herlina, Ulin; Nurjaman, Fajar; Suharno, Bambang; Mesah, Febriyani; Zulqoernain, Muhammad Syahreyzi Pashey; Al Fahmi, Muhammad Ridwan; Yuhelda; Suseno, Triswan; Bahfie, Fathan; Handoko, Anton Sapto; Zul Hakim, Hafid; Arham, La Ode
Indonesian Mining Journal Vol 28 No 2 (2025): Indonesian Mining Journal, October 2025
Publisher : Balai Besar Pengujian Mineral dan Batubara tekMIRA

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30556/imj.Vol28.No2.2025.1672

Abstract

The rapid growth of the global steel industry has significantly intensified the demand for the metallurgical-grade chromite ore required for ferrochrome production. This surge has led to a depletion of high-grade chromite reserves, necessitating the utilization of low- and medium-grade chromite to support a stable raw material supply for ferrochrome. This research was conducted to determine the characteristics of the ore and to analyze the effects of physical beneficiation processes using shaking table and Davis tube in enhancing the chromium (Cr) grade and the Cr:Fe ratio of low-grade chromite sand from Morowali, Central Sulawesi. The characterization process was conducted using XRF, XRD, and SEM-EDS. Experimental parameters for the shaking table included variations in table inclination and water flow rate, while magnetic separation was analyzed across various electric current intensities. The optimal shaking table test results were achieved at an inclination of 7.5° with a water flow rate of 18 liters/minute. In contrast, the optimal test using the Davis tube was obtained at an electric current of 0.4 amperes (660 gauss). This integrated process successfully increased Cr grade from 8.5% to 20.77% (corresponding to Cr2O3 30.36%) and improved the Cr:Fe ratio from 0.97 to 1.62, achieving a recovery rate of 94.93%.
REGULASI PENINGKATAN NILAI TAMBAH NIKEL DAN PELUANG SERTA TANTANGAN BISNIS PERTAMBANGAN MINERAL DI INDONESIA Sjahboeddin, Buana; Harjono, Dhaniswara Kwartantijono; Nainggolan, Bernard; Simatupang, Dian Puji
Indonesian Mining Journal Vol 28 No 2 (2025): Indonesian Mining Journal, October 2025
Publisher : Balai Besar Pengujian Mineral dan Batubara tekMIRA

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30556/imj.Vol28.No2.2025.1695

Abstract

This study provides a doctrinal examination of Indonesia’s legal framework regulating the increase of added value in nickel mining, with a particular focus on the coherence and enforceability of downstream mineral regulations. Employing a normative legal method combining statutory, conceptual, and analytical approaches, the research assesses the alignment between primary legislation—Law No. 4 of 2009 on Mineral and Coal Mining, as amended by Law No. 3 of 2020 and most recently by Law No. 2 of 2025—and its derivative instruments, including Government Regulation No. 23 of 2010 and successive ministerial regulations. Secondary legal materials, official government reports, international publications, and documented statistical data on nickel production and exports are examined to evaluate the extent to which the regulatory framework promotes domestic processing, legal certainty, and sustainable management of natural resources in accordance with the constitutional mandate of Article 33 of the 1945 Constitution. The findings indicate that regulatory interventions have substantively expanded domestic processing capacity and generated downstream investment, reaching approximately USD 5.03 billion, while increasing Indonesia’s nickel export value from USD 1.3 billion in 2021 to USD 6.8 billion in 2023. However, despite these economic outcomes, significant normative inconsistencies persist, including fragmented regulatory mandates, inadequate harmonization between central and sectoral regulations, and limited institutional capacity in licensing and supervision. These weaknesses manifest in ore–smelter imbalances, unequal distribution of benefits, and escalating environmental degradation, particularly deforestation, marine sedimentation, and heavy-metal contamination around mining areas. Such conditions reveal a structural discrepancy between the normative objectives of downstreaming and the principles of environmental protection, community rights, and sustainable governance mandated by Article 33 of the 1945 Constitution. This research contributes to the legal discourse by demonstrating that Indonesia’s nickel downstreaming framework remains predominantly instrumental and growth-oriented, lacking a coherent integration of environmental law, administrative accountability, and welfare-state obligations. Strengthening regulatory certainty requires harmonization of derivative regulations, binding environmental enforcement, and institutional safeguards to ensure equitable benefit distribution and long-term public welfare. These measures are crucial in operationalizing constitutional mandates and reinforcing the legitimacy of mineral governance in Indonesia.
Dari Redaksi
Indonesian Mining Journal Vol 28 No 2 (2025): Indonesian Mining Journal, October 2025
Publisher : Balai Besar Pengujian Mineral dan Batubara tekMIRA

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Abstract

Indeks Abstrak
Indonesian Mining Journal Vol 28 No 2 (2025): Indonesian Mining Journal, October 2025
Publisher : Balai Besar Pengujian Mineral dan Batubara tekMIRA

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Abstract

Catatan bagi Penulis
Indonesian Mining Journal Vol 28 No 2 (2025): Indonesian Mining Journal, October 2025
Publisher : Balai Besar Pengujian Mineral dan Batubara tekMIRA

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Page 28 of 28 | Total Record : 277

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